app.py

import gradio as gr
from langchain.text_splitter import CharacterTextSplitter
from langchain.llms import HuggingFaceHub
from langchain.embeddings import HuggingFaceEmbeddings
from langchain.vectorstores import Chroma
from langchain.chains import RetrievalQA
from langchain.document_loaders import PyMuPDFLoader

with gr.Blocks() as demo:
    pdf_file = gr.File(label='file upload', file_type='.pdf')

demo.launch()